Improvement in feed-grinding mills



WWESSE-s 2 Sheets--Sheet 1.

Patented sept. 2, |879l f/ tta Thal/y, v

N-PERS. PHOTO-LITHDBHAFHEH, WASHINGTON. D. C.

2 Sheet s-Sheet 2 L. LITCHFIEL'D. Feed-Grinding Mill.

No. 219,166.V Patented Se-pt.A 2,1879.

N. PETERS, PHOTO-LITHOGRAPMER, WASHINCll'N4 D. C.

UNITED STATES PATENT OEETGE LYMAN LI'IOHFIELD, OF WATERLOO, IOWA, ASSIGNOR OF ONE-HALF HIS RIGHT TO GEORGE W. MILLER, OF SAME PLAGE.

IMPROVEMENTIIN FEED-GRINDING MILLS.

Speciiication forming part of Letters Patent No. 219,166.. dated September 2, 1879; application filed June 11, 1879.

To all 'whom it may concern:

Be it known that I, LYMANLITCHEIELD, of Waterloo, in the county of Black Hawk and State of Iowa, have invented a new and valuable Improvementin Feed-Grindin g Mills; and I do hereby declare that the following is afull, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and tothe letters and figures of reference marked thereon.

Figure 1 of the drawings is a vertical section of a mill embodying my invention, taken on line xx of Fig. 2. Fig. 2 is a perspective view of the Vsame on a reduced scale.

The present invention has relation to an improved lnill for cracking and grinding corn into feed for farmers use, the grinding-cone of the mill being formed in two sections, and so constructed that they can be adjusted with relation to the outer casing or shell to grind coarse or fine, as will be hereinafter more fully described, and subsequently pointed out in the claim.

In the accompanying drawings, A represents the outer shell, formed of one piece of metal,

with a spider, E, at its top, and having upon iis interior circumference the usual grindingsurface.

The stationary grinding-cone is formed of vtwo sections, B C, and have upon their eXterior the customary grinding-surface, so that the corn will be ground to the required degree of fineness as it passes between it and the interior surface of the shell A. The two sections B C of the grinding-cone are held together by a central rod, a, passing through the apex of the cone or upper section, B, and through a spider, b, upon the inner circumference of the lower section, C.

The rod a is formed near its upper end with a square shoulder, d, to prevent the same from turning, the rod being tightened by nuts c upon the screwthreaded ends of said rod. The nut upon the upper end of the rod a is screwed down upon a socket, D, having triangular or curved stationary arms e, that serve as stirrers, acting with the outer shell, A, and serving to keep up a uniform supply of corn to the grinding-surfaces.

The upper section, B, of the `cone is formed with a series of inclined shoulders, f, and

guide-fingers g, and the lower section, C, is

formed with an annular rim, h, somewhat l smaller in circumference than the inner circumference of the largest part of the upper The advantage of constructing the cone to A admit of its being adjusted to regulate the degree of iineness in grinding, instead of the outer shell, admits of the shell being made in one piece, and also avoids the necessity of a multiplication of bolts and nuts or other fastening' devices, thereby greatly lessening the cost in the manufacture of this class of mills. In setting up the mill the upper section, B, of the grinding-cone is brought as close to the lower section, C, as possible, and when Wear takes place said upper section is raised the required distance to compensate for wear.

In regulating the position of the upper seetion of the grinding-cone, it is turned until the projections 7c register and rest in the required steps t', while the shoulders, which are inclined to correspond with the inclinations ot' the rim h, rest upon the rim, the iin gers g passing over upon the inside of the rim., to hold steady the upper section and retain the pro- `jections 7c in the steps. After this adjust ment has been made, the screw-rod a is tightened by the screw-nuts upon the ends thereof. Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is A feed grinding mill consisting of the grinding-cone formed in sections B C, the upper section, B, having inclined shoulders f, ngers g, and projections k, and the section C having the rim h and steps t', in combination with the outer shell, A, and the central rod, a, with nuts c, substantially as and for the purpose set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

LYMAN LITOHFIELD.

Witnesses:

GEO. W. MILLER, J osEPE 'Isnntorn` 

